Ceterach aureum (golden) is similar to C. officinarum but larger in all dimensions. Magnification reveals toothy rather than smooth scales. The species is from Madeira and the Canary Islands and best suited for Zone 7 and warmer sites.
Ceterach dalhousiae (after Countess Dalhousie, 1786-1839, of Scotland), synonyms Asplenium dalhousiae and Ceterachopsis dalhousiae, has the typically thick, deeply pin-natifid, evergreen fronds associated with Ceterach. They usually mature at 6 to 8 in. (15 to 20 cm), but lack the heavy, scaly trimmings of C. officinarum, hence the affiliation with and frequent classification as Asplenium. The distribution is downright bizarre, with scant populations in Arizona and Mexico, and abundant colonies in the Himalayas. Cultivation is difficult but possible in Zones 9 and 10.
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